Fritz Maracyn Two Bacterial Medication Powder for Freshwater and Saltwater AquariumsFritzMaracyn Two Aquarium Medication treats and controls a number of gram negative pathogenic bacteria that can cause serious disease and even death in aquarium fish. This safe, fast acting powder formula is non toxic to invertebrates and safe for use in fresh and marine aquariums. Provides broad spectrum relief from bacterial infections Treats fin and tail rot, gill disease, dropsy, popeye and more Fast dissolving powder medication For fresh and